Код AS3:
TweenLite.to(mc, getDistance (new Point(mc1.x, mc1.y), new Point(mc.x, mc.y))*0.15, {x:mc1.x, y:mc1.y})
///Дистанция между двумя точками
public function getDistance (a:Point, b:Point):Number {
return Math.sqrt((b.x - a.x)*(b.x - a.x) + (b.y - a.y)*(b.y - a.y));
}